:root { --bg: #ffffff; --fg: #1b1b1f; --muted: #5d5e67; --accent: #4355b9; --card: #f3f3f8; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #102a43; --fg: #eef1f6; --muted: #b7c0cc; --accent: #bac3ff; --card: #17364f; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
header { display: flex; align-items: center; gap: 14px; margin-bottom: 8px; }
header img { width: 64px; height: 64px; border-radius: 15px; }
h1 { font-size: 28px; line-height: 1.2; margin: 0; }
h2 { font-size: 20px; margin: 32px 0 8px; }
p, li { color: var(--fg); }
.muted { color: var(--muted); font-size: 15px; }
a { color: var(--accent); }
nav { margin: 4px 0 24px; display: flex; gap: 16px; }
.card { background: var(--card); border-radius: 14px; padding: 16px 18px; margin: 16px 0; }